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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 510 | jermar | 1 | /* |
| 2 | * Copyright (C) 2003 Josef Cejka |
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| 3 | * Copyright (C) 2005 Jakub Jermar |
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| 4 | * All rights reserved. |
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| 5 | * |
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| 6 | * Redistribution and use in source and binary forms, with or without |
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| 7 | * modification, are permitted provided that the following conditions |
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| 8 | * are met: |
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| 9 | * |
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| 10 | * - Redistributions of source code must retain the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer. |
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| 12 | * - Redistributions in binary form must reproduce the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer in the |
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| 14 | * documentation and/or other materials provided with the distribution. |
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| 15 | * - The name of the author may not be used to endorse or promote products |
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| 16 | * derived from this software without specific prior written permission. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 28 | */ |
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| 29 | |||
| 30 | #include <console/console.h> |
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| 31 | #include <console/chardev.h> |
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| 32 | #include <synch/waitq.h> |
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| 33 | #include <synch/spinlock.h> |
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| 34 | #include <arch/types.h> |
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| 35 | #include <typedefs.h> |
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| 36 | #include <arch.h> |
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| 37 | |||
| 38 | /** Standard input character device. */ |
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| 39 | chardev_t *stdin = NULL; |
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| 40 | |||
| 41 | /** Get string from character device. |
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| 42 | * |
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| 43 | * Read characters from character device until first occurrence |
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| 44 | * of newline character. |
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| 45 | * |
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| 46 | * @param chardev Character device. |
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| 47 | * @param string Buffer where to store string terminated by '\0'. |
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| 48 | * @param len Size of the buffer. |
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| 49 | */ |
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| 50 | void gets(chardev_t *chardev, __u8 *string, size_t buflen) |
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| 51 | { |
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| 52 | index_t index = 0; |
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| 53 | char ch; |
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| 54 | |||
| 55 | while (index < buflen) { |
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| 56 | ch = getc(chardev); |
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| 57 | if (ch == '\n') { /* end of string => write 0, return */ |
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| 58 | string[index] = '\0'; |
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| 59 | return; |
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| 60 | } |
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| 61 | string[index++] = ch; |
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| 62 | } |
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| 63 | return; |
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| 64 | } |
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| 65 | |||
| 66 | /** Get character from character device. |
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| 67 | * |
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| 68 | * @param chardev Character device. |
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| 69 | * |
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| 70 | * @return Character read. |
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| 71 | */ |
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| 72 | __u8 getc(chardev_t *chardev) |
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| 73 | { |
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| 74 | __u8 ch; |
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| 75 | ipl_t ipl; |
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| 76 | |||
| 77 | waitq_sleep(&chardev->wq); |
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| 78 | ipl = interrupts_disable(); |
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| 79 | spinlock_lock(&chardev->lock); |
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| 80 | ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN]; |
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| 81 | chardev->counter--; |
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| 82 | spinlock_unlock(&chardev->lock); |
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| 83 | interrupts_restore(ipl); |
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| 84 | |||
| 85 | chardev->ready_func(); |
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| 86 | |||
| 87 | return ch; |
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| 88 | } |